I will let you know, x dimension is 18"
And I'm using standard bravo 1 drives

What exhaust are you using? For some reason I was talked into a 32" Center line. Exhaust is extremely tight, as if you haven't figured that out yet...

I didn't have the heart to sell the boat w/o the exhaust Matt....that would be cruel! Although, now I need it!!! Hahaha...

Thanks Kev! I owe you a couple beers for that!

Any updates on this project? Pics ?

You've taken more than I have lol, I found with the tight engine configuration and inside headers having to be on before the engines go in there will be no way to get in there and tighten bolts for a rear motor plate so that is out. Recut transom holes to actually fit bravos, painted one half of the bilge and had some repair to do to the outside of the transom from removing the boxes

Let's see these pictures.

What about doing what I did on my front mounts on the rear? I didn't want to have to mess with the whole through bolt BS also because of the tight configuration so I took some 1/2" 6061 and taped holes in it. This way I can just run 7/16 bolts in from the front side and not have to worry about a nut on the back side. If you did this the opposite on the rear mount it would probably be easier to thread the bolts in from the back side of the engines?

Just a thought!

There's no way to get to the brackets on the inside, the headers block all access to where you could reach in and tighten the nuts

couple pics